Safe and Durable: The indoor cat door is made of ABS material, which is wear-resistant and durable. The edges are smooth and burr-free to protect the cat from scratches. Smooth design, paintable materials, perfectly match your your door and your decor. Usage: The interior cat door is suitable for all hollow doors, solid doors and interior doors. Perfect for laundry rooms, bedrooms, basements, etc. She’ll have her own activity space, and your home will smell fresh. Barrier-free door design: there is no one in the house. Put the cat food in the house. With the cat door for the interior door, there is no need to worry about the dog entering. The cat can enter and leave freely to play, eat and drink Not falling The indoor cat door is installed with screws, avoid falling and gaps caused by tape installation, no noise and no trouble caused by door locks and door damage External dimensions: 26.8 x 5.5 x 23cm, opening through: 17.5 x 3.5cm, suitable for doors 2-4.5cm thick.